Sony WRR-801A Service Manual page 28

2. S/N Check
Procedure
Step 1: Tuner [1] (Tuner unit 1) checking
(1) Set the WRR-801A as follows;
Front panel (Tuner [1])
Channel setting: Group 00, 6901 channel
(800.125 MHz)
Muting: OFF
Rear panel
ATT (ANTENNA A, B IN) switch: 0 dB
(2) Connect the audio analyzer to the TUNER OUTPUT 1
connector via MIC amp.
(3) Connect the signal generator to the ANTENNA A IN
connector with DC cut fixture.
(4) Set the signal generator as follows:
Signal generator setting
FREQUENCY (Carrier frequency): 800.125 MHz
RF OUTPUT (Output level): 60 dBuV
MODULATION (Modulation frequency): 1 kHz
DEVIATION (Frequency deviation): ± 5 kHz
(5) Read the output level of the TUNER OUTPUT 1
connector (Audio analyzer indication level). This level
is specified to be 0 dB.
(6) Turn OFF the MODULATION (modulation
frequency) of the signal generator (No modulation).
(7) Check that output level of the TUNER OUTPUT 1 is
_62 dB or less (S/N is 62 dB or more with A-weighted
filter) as compared with the level of procedure (4)
above.
(8) Change the RF OUTPUT (output level) of the signal
generator as shown below.
RF OUTPUT (output level): 20 dBuV
(9) Check that output level of the TUNER OUTPUT 1 is
_40 dB or less (S/N is 40 dB or more with A-weighted
filter) as compared with the level of procedure (5)
above.
(10)Change the RF OUTPUT (output level) of the signal
generator as shown below.
RF OUTPUT (output level): 60 dBuV
3-10
EMF
(= _53 dBm)
EMF
(= _93 dBm)
EMF
(= _53 dBm)
(11)Set the audio analyzer to the distortion mode.
(12)Check that distortion ratio is _43 dB or less (0.7 % or
less).
(13)Connect the signal generator to the ANTENNA B IN
connector with DC cut fixture.
(14)Perform the procedures (4) through (12) above.
(15)Set the channel and FREQUENCY (carrier frequency)
of the signal generator as shown 1 and 2 below.
Perform the procedures (1) to (14) above, for each
channel setting (1 and 2).
1 Channel setting (Tuner [1]):
Signal generator setting:
FREQUENCY (Carrier frequency); 794.125 MHz
2 Channel setting (Tuner [1]):
Signal generator setting:
FREQUENCY (Carrier frequency); 805.875 MHz
Step 2: Tuner [2] to [6] checking
When the TUNER UNIT WRU-801A is installed in the
Tuner [2] (Tuner unit 2) to Tuner [6] (Tuner unit 6) of the
WRR-801A, perform the adjustments from procedures (1)
to (15) of "Step 1. Tuner [1] (Tuner unit 1) checking" on
the respective tuner units that are installed in the WRR-
801A.
When performing the above described checking change the
following details as shown below, of the "Step 1. Tuner
[1] (Tuner unit 1) checking".
Tuner [1] → Tuner [2], [3], [4], [5], and [6]
TUNER OUTPUT 1 → TUNER OUTPUT 2, 3, 4, 5, and 6
Group 00, 6801 channel
(794.125 MHz)
Group 00, 6947 channel
(805.875 MHz)
WRR-801A
WRU-801A